<template>
  <div :id="containerId" style="position: relative">

    <!--  ---------------------------- begin 图片左右换位置 ------------------------------------- -->
    <div class="movety-container" :style="{top:top+'px',left:left+'px',display:moveDisplay}" style="padding:0 8px;position: absolute;z-index: 91;height: 32px;width: 104px;text-align: center;">
      <div :id="containerId+'-mover'" :class="showMoverTask?'uploadty-mover-mask':'movety-opt'" style="margin-top: 12px">
        <a @click="moveLast" style="margin: 0 5px;"><a-icon type="arrow-left" style="color: #fff;font-size: 16px"/></a>
        <a @click="moveNext" style="margin: 0 5px;"><a-icon type="arrow-right" style="color: #fff;font-size: 16px"/></a>
      </div>
    </div>
    <!--  ---------------------------- end 图片左右换位置 ------------------------------------- -->

    <a-upload
      name="file"
      :multiple="multiple"
      :action="uploadAction"
      :headers="headers"
      :data="{'biz':bizPath}"
      :fileList="fileList"
      :beforeUpload="doBeforeUpload"
      @change="handleChange"
      :disabled="disabled"
      :returnUrl="returnUrl"
      :listType="complistType"
      @preview="handlePreview"
      :class="{'uploadty-disabled':disabled}">
      <template>
        <div v-if="isImageComp">
          <a-icon type="plus" />
          <div class="ant-upload-text">{{ text }}</div>
        </div>
        <a-button v-else-if="buttonVisible">
          <a-icon type="upload" />{{ text }}
        </a-button>
      </template>
    </a-upload>
    <a-modal :visible="previewVisible" :footer="null" @cancel="handleCancel">
      <img alt="example" style="width: 100%" :src="previewImage" />
    </a-modal>
  </div>
</template>

<script>

  import Vue from 'vue'
  import { ACCESS_TOKEN } from '@/store/mutation-types'
  import { getFileAccessHttpUrl } from '@/api/manage';
  import { apiUrl } from '@/api/api.js'

  const FILE_TYPE_ALL = 'all'
  const FILE_TYPE_IMG = 'image'
  const FILE_TYPE_TXT = 'file'
  const uidGenerator = () => {
    return '-' + parseInt(Math.random() * 10000 + 1, 10);
  }
  const getFileName = (path) => {
    if (path.lastIndexOf('\\') >= 0) {
      let reg = new RegExp('\\\\', 'g');
      path = path.replace(reg, '/');
    }
    return path.substring(path.lastIndexOf('/') + 1);
  }
  export default {
    name: 'JUpload',
    data() {
      return {
        uploadAction: apiUrl.fileUpload,
        headers: {},
        fileList: [],
        newFileList: [],
        uploadGoOn: true,
        previewVisible: false,
        // ---------------------------- begin 图片左右换位置 -------------------------------------
        previewImage: '',
        containerId: '',
        top: '',
        left: '',
        moveDisplay: 'none',
        showMoverTask: false,
        moverHold: false,
        currentImg: ''
        // ---------------------------- end 图片左右换位置 -------------------------------------
      }
    },
    props: {
      text: {
        type: String,
        required: false,
        default: '点击上传'
      },
      fileType: {
        type: String,
        required: false,
        default: FILE_TYPE_ALL
      },
      /* 这个属性用于控制文件上传的业务路径 */
      bizPath: {
        type: String,
        required: false,
        default: 'temp'
      },
      value: {
        type: [String, Array],
        required: false
      },
      // update-begin- --- author:wangshuai ------ date:20190929 ---- for:Jupload组件增加是否能够点击
      disabled: {
        type: Boolean,
        required: false,
        default: false
      },
      // update-end- --- author:wangshuai ------ date:20190929 ---- for:Jupload组件增加是否能够点击
      // 此属性被废弃了
      triggerChange: {
        type: Boolean,
        required: false,
        default: false
      },
      /**
       * update -- author:lvdandan -- date:20190219 -- for:Jupload组件增加是否返回url，
       * true：仅返回url
       * false：返回fileName filePath fileSize
       */
      returnUrl: {
        type: Boolean,
        required: false,
        default: true
      },
      number: {
        type: Number,
        required: false,
        default: 0
      },
      buttonVisible: {
        type: Boolean,
        required: false,
        default: true
      },
      multiple: {
        type: Boolean,
        default: true
      },
      beforeUpload: {
        type: Function
      },
    },
    watch: {
      value: {
        immediate: true,
        handler() {
          let val = this.value
          if (val instanceof Array) {
            if (this.returnUrl) {
              this.initFileList(val.join(','))
            } else {
              this.initFileListArr(val);
            }
          } else {
            this.initFileList(val)
          }
        }
      }
    },
    computed: {
      isImageComp() {
        return this.fileType === FILE_TYPE_IMG
      },
      complistType() {
        return this.fileType === FILE_TYPE_IMG ? 'picture-card' : 'text'
      }
    },
    created() {
      const token = Vue.ls.get(ACCESS_TOKEN);
      // ---------------------------- begin 图片左右换位置 -------------------------------------
      this.headers = { 'X-Access-Token': token };
      this.containerId = 'container-ty-' + new Date().getTime();
      // ---------------------------- end 图片左右换位置 -------------------------------------
    },

    methods: {
      initFileListArr(val) {
        if (!val || val.length === 0) {
          this.fileList = [];
          return;
        }
        let fileList = [];
        for (var a = 0; a < val.length; a++) {
          let url = getFileAccessHttpUrl(val[a].filePath);
          fileList.push({
            uid: uidGenerator(),
            name: val[a].fileName,
            status: 'done',
            url: url,
            response: {
              status: 'history',
              message: val[a].filePath
            }
          })
        }
        this.fileList = fileList
      },
      initFileList(paths) {
        if (!paths || paths.length === 0) {
          // return [];
          // update-begin- --- author:os_chengtgen ------ date:20190729 ---- for:issues:326,Jupload组件初始化bug
          this.fileList = [];
          return;
          // update-end- --- author:os_chengtgen ------ date:20190729 ---- for:issues:326,Jupload组件初始化bug
        }
        let fileList = [];
        let arr = paths.split(',')
        for (var a = 0; a < arr.length; a++) {
          let url = getFileAccessHttpUrl(arr[a]);
          fileList.push({
            uid: uidGenerator(),
            name: getFileName(arr[a]),
            status: 'done',
            url: url,
            response: {
              status: 'history',
              message: arr[a]
            }
          })
        }
        this.fileList = fileList
      },
      handlePathChange() {
        let uploadFiles = this.fileList
        let path = ''
        if (!uploadFiles || uploadFiles.length === 0) {
          path = ''
        }
        let arr = [];

        for (var a = 0; a < uploadFiles.length; a++) {
          // update-begin-author:lvdandan date:20200603 for:【TESTA-514】【开源issue】多个文件同时上传时，控制台报错
          if (uploadFiles[a].status === 'done') {
            arr.push(uploadFiles[a].response.message)
          } else {
            return;
          }
          // update-end-author:lvdandan date:20200603 for:【TESTA-514】【开源issue】多个文件同时上传时，控制台报错
        }
        if (arr.length > 0) {
          path = arr.join(',')
        }
        this.$emit('change', path);
      },
      doBeforeUpload(file){
        this.uploadGoOn=true
        var fileType = file.type;
        if (this.fileType === FILE_TYPE_IMG) {
          if (fileType.indexOf('image') < 0) {
            this.$message.warning('请上传图片');
            this.uploadGoOn = false
            return false;
          }
        }
        // 扩展 beforeUpload 验证
        if (typeof this.beforeUpload === 'function') {
          return this.beforeUpload(file)
        }
        return true
      },
      handleChange(info) {
        console.log('--文件列表改变--')
        if (!info.file.status && this.uploadGoOn === false) {
          info.fileList.pop();
        }
        let fileList = info.fileList
        if (info.file.status === 'done') {
          if (this.number > 0) {
            fileList = fileList.slice(-this.number);
          }
          if (info.file.response.success) {
            fileList = fileList.map((file) => {
              if (file.response) {
                let reUrl = file.response.message;
                file.url = getFileAccessHttpUrl(reUrl);
              }
              return file;
            });
          }
          // this.$message.success(`${info.file.name} 上传成功!`);
        } else if (info.file.status === 'error') {
          this.$message.error(`${info.file.name} 上传失败.`);
        } else if (info.file.status === 'removed') {
          this.handleDelete(info.file)
        }
        this.fileList = fileList
        if (info.file.status === 'done' || info.file.status === 'removed') {
          // returnUrl为true时仅返回文件路径
          if (this.returnUrl) {
            this.handlePathChange()
          } else {
            // returnUrl为false时返回文件名称、文件路径及文件大小
            this.newFileList = [];
            for (var a = 0; a < fileList.length; a++) {
              // update-begin-author:lvdandan date:20200603 for:【TESTA-514】【开源issue】多个文件同时上传时，控制台报错
              if (fileList[a].status === 'done') {
                var fileJson = {
                  fileName: fileList[a].name,
                  filePath: fileList[a].response.message,
                  fileSize: fileList[a].size
                };
                this.newFileList.push(fileJson);
              } else {
                return;
              }
              // update-end-author:lvdandan date:20200603 for:【TESTA-514】【开源issue】多个文件同时上传时，控制台报错
            }
            this.$emit('change', this.newFileList);
          }
        }
      },
      handleDelete(file) {
        // 如有需要新增 删除逻辑
        console.log(file)
      },
      handlePreview(file) {
        if (this.fileType === FILE_TYPE_IMG) {
          this.previewImage = file.url || file.thumbUrl;
          this.previewVisible = true;
        } else {
          location.href = file.url
        }
      },
      handleCancel() {
        this.previewVisible = false;
      },
      // ---------------------------- begin 图片左右换位置 -------------------------------------
      moveLast() {
        // console.log(ev)
        // console.log(this.fileList)
        // console.log(this.currentImg)
        let index = this.getIndexByUrl();
        if (index === 0) {
          this.$message.warn('未知的操作')
        } else {
          let curr = this.fileList[index].url;
          let last = this.fileList[index - 1].url;
          let arr = []
          for (let i = 0; i < this.fileList.length; i++) {
            if (i === index - 1) {
              arr.push(curr)
            } else if (i === index) {
              arr.push(last)
            } else {
              arr.push(this.fileList[i].url)
            }
          }
          this.currentImg = last
          this.$emit('change', arr.join(','))
        }
      },
      moveNext() {
        let index = this.getIndexByUrl();
        if (index === this.fileList.length - 1) {
          this.$message.warn('已到最后~')
        } else {
          let curr = this.fileList[index].url;
          let next = this.fileList[index + 1].url;
          let arr = []
          for (let i = 0; i < this.fileList.length; i++) {
            if (i === index + 1) {
              arr.push(curr)
            } else if (i === index) {
              arr.push(next)
            } else {
              arr.push(this.fileList[i].url)
            }
          }
          this.currentImg = next
          this.$emit('change', arr.join(','))
        }
      },
      getIndexByUrl() {
        for (let i = 0; i < this.fileList.length; i++) {
          if (this.fileList[i].url === this.currentImg || encodeURI(this.fileList[i].url) === this.currentImg) {
            return i;
          }
        }
        return -1;
      }
    },
    mounted() {
      const moverObj = document.getElementById(this.containerId + '-mover');
      if (moverObj) {
        moverObj.addEventListener('mouseover', () => {
          this.moverHold = true
          this.moveDisplay = 'block';
        });
        moverObj.addEventListener('mouseout', () => {
          this.moverHold = false
          this.moveDisplay = 'none';
        });
      }

      let picList = document.getElementById(this.containerId) ? document.getElementById(this.containerId).getElementsByClassName('ant-upload-list-picture-card') : [];
      if (picList && picList.length > 0) {
        picList[0].addEventListener('mouseover', (ev) => {
          ev = ev || window.event;
          let target = ev.target || ev.srcElement;
          if (target.className === 'ant-upload-list-item-info') {
            this.showMoverTask = false
            let item = target.parentElement
            this.left = item.offsetLeft
            this.top = item.offsetTop + item.offsetHeight - 50;
            this.moveDisplay = 'block';
            this.currentImg = target.getElementsByTagName('img')[0].src
          }
        });

        picList[0].addEventListener('mouseout', (ev) => {
          ev = ev || window.event;
          let target = ev.target || ev.srcElement;
          // console.log('移除',target)
          if (target.className === 'ant-upload-list-item-info') {
            this.showMoverTask = true
            setTimeout(() => {
              if (this.moverHold === false) { this.moveDisplay = 'none'; }
            }, 100)
          }
          if (target.className === 'ant-upload-list-item ant-upload-list-item-done' || target.className === 'ant-upload-list ant-upload-list-picture-card') {
            this.moveDisplay = 'none';
          }
        })
        // ---------------------------- end 图片左右换位置 -------------------------------------
      }
    },
    model: {
      prop: 'value',
      event: 'change'
    }
  }
</script>

<style lang="less">
.uploadty-disabled{
  .ant-upload-list-item {
    .anticon-close{
      display: none;
    }
    .anticon-delete{
      display: none;
    }
  }
}
  //---------------------------- begin 图片左右换位置 -------------------------------------
  .uploadty-mover-mask{
    background-color: rgba(0, 0, 0, 0.5);
    opacity: .8;
    color: #fff;
    height: 28px;
    line-height: 28px;
  }
  //---------------------------- end 图片左右换位置 -------------------------------------
</style>
